HUNDREDS OF RAIDS AND THOUSANDS OF BOMBS ONLY DENTED THE 7- LAYERED BUNKER ROOFS. CRUDELY SPLASHED ON A PEN WALL ARE THE NAMES OF 2 U-BOAT SAILORS, BUT DID THEY LIVE TO SAIL AGAIN? THE U.S. EIGHTH AIR FORCE ALONE LOST 30,000 MEN IN FUTILE ATTACKS AGAINST THE U-BOAT PENS.